Heating Yarn Lubricant Flexlife
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Yarns comprising bundles of metal fibers used in car seat heating systems face premature failure due to repeated stress and strain, particularly bending, which reduces their lifespan and functionality.
Innovation Solution
A yarn comprising multiple bundles of metal fibers, twisted and coated with a solvent-based lubricant containing a polymer binder and solid particles, which enhances the yarn's resistance to bending and wear, thereby increasing its flexlife by up to 300% compared to non-lubricated yarns.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If yarns comprising bundles of metal fibres are used in car seat heating systems, then electrical conductivity and heating function are provided, but the yarns fail prematurely due to repeated bending and stress
Solution Approach 1:
The patent applies a lubricant coating to the metal fibres before they are subjected to repeated bending stresses. This lubricant layer acts as a protective cushion that reduces friction and wear between fibre strands during flexing, preventing premature failure and extending the yarn's operational lifespan in heating applications.
2Reliability
If oil-based lubricants are applied to reduce friction and improve flexlife, then bending resistance increases, but skin irritation and staining of clothing occurs
Solution Approach 1:
The patent changes the chemical parameters of the lubricant by selecting specific substances with different properties from conventional oil-based lubricants. The chosen lubricants have molecular structures and chemical compositions that provide adequate lubrication for flexlife improvement while lacking the properties that cause skin irritation and staining, thus resolving the harmful effects.
Solution Approach 2:
The patent employs lubricants that form a temporary protective layer on the metal fibres during manufacturing and initial use, providing sufficient flexlife improvement without requiring long-term persistence. These lubricants are designed to be safe even if they migrate to skin or clothing, effectively treating the lubrication function as a short-term protective measure rather than a permanent coating.
3Reliability
If a solvent-based lubricant comprising polymer binder and solid particles is applied, then flexlife increases by up to 300%, but the complexity of the lubricant composition increases
Solution Approach 1:
The patent employs a composite lubricant formulation consisting of a solvent-based carrier, polymer binder, and solid particle additives. This composite structure combines the benefits of each component: the solvent provides penetration and initial lubrication, the polymer binder ensures adhesion and film formation, and the solid particles provide extreme pressure protection and wear reduction, achieving superior flexlife improvement despite the increased compositional complexity.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solvent-based lubricant significantly improves the yarn's flexlife, making it more resistant to corrosion, skin-friendly, and suitable for car seat heating applications, while maintaining electrical conductivity and mechanical strength.
Implementation Method 1
The application of a lubricant may result in a reduction of the friction coefficient. As such, lubricants are e.g. applied to reduce the friction of screws.
Implementation Method 2
Such yarns are e.g. applied in vehicle seat heating systems or heatable textiles. In these applications, the yarns are used as an electrical resistance and provided, in use, with an electric current to obtain the required heating effect.
Data Source
Figure 1~2b
Figure 3~4
AI summary
A yarn (100) suitable for a car seat heating system comprising one or more bundles (110,120,130), each bundle comprising at least ten metal fibres (140) is described. The twisted yarn further comprises a solvent-based lubricant, said lubricant comprising a polymer binder and solid particles. It has been found that the application of such particular lubricant to the yarn provides for an improved flexlife of the yarn.